1: Name of the extremely effective firs extinguishing agent is
A. helium
B. halons
C. halogens
D. argon
2: Gas molecules that absorb thermal infrared radiation and are present in large quantity to change the climate system are known as
A. alpha radiations
B. beta radiations
C. ozone gases
D. greenhouse gases
3: Chemical substance used in industry for cold cleaning, adhesives and vapor degreasing is
A. methyl chloroform
B. carbon tetrachloride
C. halons
D. hydrocarbons

4: Layer of atmosphere in which the Ozone layer lies is
A. exosphere
B. mesosphere
C. troposphere
D. stratosphere
5: Greenhouse gases which is present in very high quantity is
A. propane
B. ethane
C. carbon dioxide
D. methane
6: Exchange of outgoing and incoming radiations that keep the Earth warm is known as
A. greenhouse effect
B. radiation effect
C. infrared effect
D. ozone layer depletion

7. Which currency has shown the greatest proportionate change in value between Weeks 1 and 4?
(A) Euro
(B) US $
(C) Japanese Yen
(D) South African Rand
(E) Can’t tell from data

Hydrogen-fuelled cars are not reliant upon petrol or diesel, which potentially makes them safer. Hydrogen fuel can be produced from renewable sources, such as wind fuels. Since cars account for roughly a third of greenhouse gas emissions, these futuristic vehicles could form part of an effective strategy to combat global warming. This is an idealistic scenario and there are many barriers to be overcome first. The
existing designs for hydrogen-fuelled cars are extremely expensive. The National Research Association also estimates that £8 billion would be needed to set-up the refuelling stations required by hydrogen-fuelled cars...
8. Which two of these statements must be true?
A. The first hydrogen-fuelled car was too expensive for consumers
B. The passage questions the viability of hydrogen-fuelled cars as a solution to global warming.
C. Hydrogen fuel cars provide an effective strategy to combat global warming
D. Hydrogen fuelled car is the cleanest when compared to the other two